# n4Studies vs PSU LibX

The clearest difference is price: PSU LibX at Free against n4Studies's $1.99. PSU LibX also leads on update cadence (every 4 days vs every 4 months) and iOS requirement (13.0 vs 16.0). n4Studies's advantage is chart position (#186 vs unranked). On review sentiment, ads, in-app purchases and device support there is nothing between them.

PSU LibX is free to download; n4Studies costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

n4Studies ships an update every 4 months, PSU LibX every 4 days. The most recent releases landed on August 7, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | n4Studies | PSU LibX |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/n4studies/id680516901/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Paid | **Free** |
| Best chart rank | **#186** | — |
| Size | 8 MB | 50 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chetta Ngamjarus](https://appshunter.io/developer/680516904) | [PRINCE OF SONGKLA UNIVERSITY](https://appshunter.io/developer/1456089991) |

## What reviewers say

### n4Studies

[App page](https://appshunter.io/ios/app/n4studies/id680516901)

**Currently charting:** #186 Top Paid · Education (US App Store)

This application simplifies sample size and study power calculations for various research designs. It offers tools for estimating population means and proportions, comparing groups, and analyzing different study types like case-control and randomized controlled trials. Results can be easily shared via email.

**Highlights:** Calculate sample size for infinite/finite populations, Compare two population means/proportions, Calculate sample size for various study designs, Calculate study power for comparisons, Calculate study power for various study designs, Share results via email

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### PSU LibX

[App page](https://appshunter.io/ios/app/psu-libx/id6470150838)

Enhance your library experience with this app, offering features like QR code entry, book searching across multiple campuses, and self-checkout. It also allows for fine payments and free eBook access.

**Highlights:** QR code/barcode for library entry, Search books across 5 campuses, Self-checkout books, Pay library fines, Read free eBooks, Face recognition entry, Biometric authentication

**In-app purchases:** none


## Frequently asked questions

### Is n4Studies free?

n4Studies costs $1.99, with no in-app purchases.

### Is PSU LibX free?

PSU LibX is free to download, with no in-app purchases.

### Do n4Studies or PSU LibX have ads?

Neither n4Studies nor PSU LibX shows ads.

### Which is updated more often, n4Studies or PSU LibX?

n4Studies ships an update every 4 months, and PSU LibX every 4 days. Most recently, n4Studies was updated on August 7, 2026 and PSU LibX on June 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*